Just updated to MrMC 3.0.3, audio is still out of sync after a few seconds
After about 30 seconds it stopped for half a second, I see the little playbar in the top right corner, and the sound is synced for a few seconds... This repeats all the time

I got this, you mean "Calibrate Display", right? Yes, I has this enabled at 3%. I disabled it, and the sound was perfectly synced with the video. Even SMPC can play the videos without stuttering anymore!

I got this, you mean "Calibrate Display", right? Yes, I has this enabled at 3%. I disabled it, and the sound was perfectly synced with the video. Even SMPC can play the videos without stuttering anymore!

Downside: I loose a few pixels at every side now...

Do you have a setting on your TV that can remove that overscan? If so, that's where the change should be made.